package com.barry.algorithm.search;

import java.util.ArrayList;
import java.util.List;

/**
 * 类功能描述:
 *
 * @author Barry
 * @version 1.0.0
 * @auther Create by Barry
 * @date Create on 2018/3/12.
 * @history
 */
public class BinarySearch {

    public static int binarySearch(List<Integer> list, int k){
        if(list == null || list.isEmpty()){
            new RuntimeException("请传入正确的列表");
        }
        int min = 0;
        int max = list.size()-1;
        int middle;
        while(min <= max){
            middle = (min+max)/2;
            int data = list.get(middle);
            if(data == k ){
                return middle;
            }
            if(data < k){
                min = middle+1;
            }
            if(data > k){
                max = middle-1;
            }
        }
        return -1;
    }

    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>();
        list.add(-200);
        list.add(-30);
        list.add(-10);
        list.add(3);
        list.add(5);
        list.add(8);
        list.add(10);
        list.add(100);
        list.add(1000);
        System.out.println(BinarySearch.binarySearch(list, 8));
    }
}
